KR20180091809A - Transmitter, receiver, and transmit / receive system - Google Patents

Abstract

The transmitter includes a transmitter controller for generating transmission data to be transmitted to the receiver. The transmission data includes variable data and verification data. The verification data is data for verifying the ID code registered in the transmitter with the ID code registered in the receiver in the verification unit of the receiver. The transmitter control unit can switch to the first state or the second state. The first state is a state in which fixed data indicating identification information is transmitted as verification data. The second state is a state in which the operation data calculated from the variable data and the fixed data is transmitted as the verification data.

Description

Transmitter, receiver, and transmit / receive system

The present invention relates to a transmitter, a receiver, and a transmission / reception system.

A transmission / reception system for receiving transmission data transmitted from a transmitter by a receiver is known. In the transmission / reception system, a transmitter and a receiver are associated with each other. The receiver recognizes that only transmission data transmitted from the associated transmitter is transmission data transmitted toward itself. The transmitter includes a transmitter storage unit and a power source in which individual identification information is stored. The receiver has a storage for the receiver in which the identification information of the associated transmitter is stored. As a result, the same identification information is registered in the receiver and the transmitter associated with the receiver, respectively. By registering the same identification information, the transmitter and the receiver are associated with each other. The transmitter generates transmission data including data indicating information to be acquired by the receiver and verification data for collating the identification information with the receiver, and transmits the transmission data to the receiver. When receiving the transmission data, the receiver collates the identification information of the transmitter that transmitted the transmission data with the identification information registered in the receiver, based on the verification data included in the transmission data and the identification information stored in the receiver storage section. When the identification information registered in the transmitter that transmitted the transmission data matches the identification information registered in the receiver, the receiver recognizes that the transmission data is the transmission data transmitted toward the receiver itself.

As an example of the transceiver system, there is a transmission / reception system disclosed in, for example, Patent Document 1. The transmitter described in Patent Document 1 calculates exclusive-OR data by taking exclusive-OR data of fixed data, which is data representing identification information, and variable data capable of obtaining a different value. The transmitter transmits the computed exclusive OR data as transmission data. The receiver obtains exclusive OR of the fixed data stored in the storage for the receiver and the exclusive-OR data, thereby restoring the fixed data and the variable data from the received transmission data. The receiver collates the fixed data stored in the storage for the receiver with the fixed data restored from the exclusive OR data.

However, the transmission of the transmission data consumes the power of the power source. Therefore, in order to increase the lifetime of the power source, it is necessary to reduce the power required for transmission. To do so, it is desirable to shorten the data length of the transmission data transmitted from the transmitter. The transmitter described in Patent Document 1 transmits transmission data including exclusive OR data instead of fixed data and variable data. Therefore, the data length of the transmission data becomes shorter than that in the case of transmitting the fixed data and the variable data itself. However, when the exclusive OR of the fixed data and the variable data is intended, the data length of the fixed data becomes the same as that of the exclusive OR data. That is, the data length of the exclusive OR data does not become shorter than the fixed data. Therefore, in the transmitter disclosed in Patent Document 1, the reduction of the data length of the transmission data is hindered by the fixed data.

Patent Document 1: JP-A-2013-46148

It is an object of the present invention to provide a transmitter, a receiver, and a transmission / reception system that can extend the life of a power source of a transmitter.

According to a first aspect of the present invention, there is provided a transmitter for transmitting transmission data to a receiver. The transmitter includes a power source, a storage unit for storing the identification information, identification information stored in the storage unit for the transmitter, and identification information registered in the receiver, with verification data for verifying the verification unit provided in the receiver, And a data generating unit for generating transmission data including variable data that can be taken. The data generating unit can generate the calculation data from the fixed data indicating the identification information stored in the transmitter storage unit and the variable data and the calculation data shorter than the fixed data as the verification data.

According to a second aspect of the present invention, there is provided a receiver for receiving transmission data transmitted from a transmitter. The receiver includes a receiver for receiving the transmission data, an acquisition unit for acquiring the verification data included in the transmission data and the variable data capable of taking other values from the transmission data received by the reception unit, a receiver storage unit And a verification unit for verifying the identification information registered in the transmitter that has transmitted the transmission data based on the verification data and the data indicating the identification information stored in the storage unit for the receiver, against the identification information stored in the receiver storage unit. When the obtaining unit obtains the fixed data indicating the identification number registered in the transmitter and the calculation data calculated from the variable data and shorter in length than the fixed data as the verification data, the verification unit compares the calculation data, the variable data, The identification information registered in the transmitter is compared with the identification information registered in the receiver by confirming whether or not the data calculated from the data indicating the stored identification information coincide with each other.

According to a third aspect of the present invention, there is provided a transmission / reception system including a transmitter for transmitting transmission data and a receiver for receiving transmission data transmitted from the transmitter. The transmitter includes a power source, a transmitter storage unit in which identification information is stored, control data used for collating the identification information stored in the transmitter storage unit and the identification information registered in the receiver, and variable data capable of taking other values And a data generation unit for generating transmission data including the transmission data. The data generation unit can generate, as verification data, fixed data representing the identification information stored in the storage unit for the transmitter and calculation data which is calculated from the variable data and shorter in length than the fixed data. The receiver includes a receiver for receiving the transmission data, an acquisition unit for acquiring the verification data and the variable data from the transmission data received by the reception unit, the receiver storage unit storing the identification information, and the storage unit for the verification data and the receiver And a verification unit for verifying the identification information registered in the transmitter that transmitted the transmission data based on the data indicating the stored identification information against the identification information stored in the reception-use storage unit. When the calculation data is acquired as the verification data by the acquisition unit, the verification unit verifies whether or not the calculation data and the data calculated from the data indicating the identification data stored in the variable data storage and the receiver storage unit coincide with each other, And collates the identification information with the identification information registered in the receiver.

1 is a schematic diagram of a tire condition monitoring system and a trigger device according to a first embodiment.
2 is a schematic configuration diagram of a transmitter and a trigger device according to the first embodiment.
3 (a) is a schematic diagram showing a frame format of first data, and (b) is a schematic diagram showing a frame format of second data.
4A is a table showing first data, and FIG. 4B is a table showing second data.
5 is a table showing ID codes stored in a storage for a receiver.
6 is a table showing error detection codes calculated from the variable data included in the second data and the ID code stored in the receiver storage section.
7 is a flowchart showing processing performed by the controller for the transmitter.
8 is a table showing an ID code shuffled by the shuffle pattern.
9 is a table showing error detection codes calculated from ID codes obtained by shuffling variable data included in the second data and ID codes stored in the storage for a receiver in a shuffle pattern.
10 is a schematic configuration diagram of a vehicle communication system according to the fifth embodiment.

(First Embodiment)

Hereinafter, a first embodiment of a transmitter, a receiver, and a transmission / reception system will be described.

1, the tire condition monitoring system 20 as a transmission / reception system includes a transmitter 21 mounted on four wheels 11 of a vehicle 10, a receiver 40 mounted on the vehicle 10, . Each of the wheels 11 has a wheel 12 and a tire 13 mounted on the wheel 12. The right wheel FR, the left wheel FR, the rear wheel RR, and the left wheel RL, respectively, of the wheels 11 will be described. The transmitter 21 is fixed to the tire valve, or fixed to the wheel 12 or the tire 13 is used.

The transmitter 21 is installed on the wheel 11 so as to be disposed in the inner space of the tire 13. [ The transmitter 21 detects the state of the corresponding tire 13 (for example, the tire air pressure or the temperature in the tire) and transmits the transmission data including the detected information of the tire 13 to the receiver 40 do. The tire condition monitoring system 20 monitors the condition of the tire 13 by receiving the transmission data transmitted from the transmitter 21 at the receiver 40. [ The transmitter 21 is a vehicle transmitter that transmits data related to the vehicle 10 and the receiver 40 is a vehicle receiver that receives data related to the vehicle 10. [

2, the transmitter 21 includes a pressure sensor 22, a temperature sensor 23, an acceleration sensor 24, a transmitter controller 25, a transmitter circuit 26, a trigger receiver 32, An antenna 28, a reception antenna 29, a battery 30, and a voltage sensor 31. The battery 30 becomes the power source of the transmitter 21. [ The battery 30 may be a power storage device such as a primary battery, a secondary battery, or a capacitor.

The pressure sensor 22 detects the air pressure of the corresponding tire 13. The pressure sensor 22 outputs the detection result to the controller 25 for the transmitter. The temperature sensor 23 detects the temperature in the corresponding tire 13. The temperature sensor 23 outputs the detection result to the transmitter controller 25. The acceleration sensor 24 rotates together with the wheel 11 to detect an acceleration acting on itself. The acceleration sensor 24 outputs the detection result to the transmitter controller 25. The acceleration sensor 24 is installed to detect the centrifugal acceleration due to the rotation of the wheel 11. [ In this case, the detection axis of the acceleration sensor 24 is directed in the direction in which the centrifugal acceleration acts. The pressure sensor 22, the temperature sensor 23, and the acceleration sensor 24 function as a detection unit. The voltage sensor 31 detects the voltage of the battery 30 (voltage across the battery 30). The voltage sensor 31 outputs the detection result to the transmitter controller 25.

The transmitter control unit 25 is composed of a microcomputer or the like including a CPU 25a and a transmitter storage unit 25b (RAM, ROM, etc.). The transmitter storage unit 25b stores an ID code which is data representing unique identification information of each transmitter 21. [ Thus, the ID code is registered in the transmitter 21. The transmitter storage unit 25b stores various programs for controlling the transmitter 21. [ The program includes a program for switching the ocean of transmission data transmitted from the transmitter 21, and the like. The transmitter control unit 25 has a timer function. The timing function is realized by, for example, a timer or a counter.

The transmitter control unit 25 controls the pressure sensor 22, the temperature sensor 23, the acceleration sensor 24, and the voltage sensor 31 at predetermined intervals (for example, every several seconds to several tens of seconds) And acquires the detected result to obtain the detected value. The detection values are obtained by AD conversion of the outputs of the sensors 22, 23, 24, and 31. AD conversion may be performed in each of the sensors 22, 23, 24, and 31, and may be performed in the controller 25 for the transmitter. That is, each of the sensors 22, 23, 24, and 31 or the transmitter control unit 25 includes an AD converter. The detected values are pressure, temperature, acceleration, and voltage. The transmitter control unit 25 generates transmission data including the tire state (for example, the tire air pressure and the temperature in the tire) and the ID code based on the detection result. The transmission data is digital data and is a binary or hexadecimal data string. The transmitter control unit 25 outputs the generated transmission data to the transmission circuit 26. [ The transmission circuit 26 modulates the transmission data output from the transmitter controller 25. [ The modulated transmission data is transmitted from the transmission antenna 28 as a radio signal. A radio signal is a signal including transmission data. The radio signal is transmitted as a signal of an RF band (for example, 315 MHz band or 434 MHz band).

The transmitter control unit 25 determines whether the vehicle 10 is running or stopped based on the acceleration detected by the acceleration sensor 24. The acceleration acting on the acceleration sensor 24 increases as the vehicle speed increases . If the acceleration detected by the acceleration sensor 24 is equal to or larger than the threshold value for judging driving, the transmitter control unit 25 determines that the vehicle 10 is traveling. If the acceleration detected by the acceleration sensor 24 is less than the threshold value for judging driving, the transmitter control unit 25 determines that the vehicle 10 is stopped. A value larger than the acceleration detected by the acceleration sensor 24 when the vehicle 10 is stopped is set in consideration of the tolerance and the like in the running determination threshold value. The transmitter control unit 25 transmits the transmission data at a higher frequency than during the stop of the vehicle 10 while the vehicle 10 is running.

Further, the transmitter control unit 25 makes a fault determination from the obtained detection value. The detection values of the sensors 22, 23, 24, and 31 are set in a range that can be taken in advance. When a detection value exceeding this range is detected, the transmitter controller 25 determines that each of the sensors 22, 23, 24, 31 is broken (for example, broken wire or short circuit).

The transmitter control unit 25 of the transmitter 21 is switched to the first state or the second state. In the first state and the second state, the format (frame format) of transmission data generated in the transmitter controller 25 is different. Transmission data generated when the transmitter controller 25 is in the first state is referred to as first data. And transmission data generated when the transmitter controller 25 is in the second state is referred to as second data. First, the first data will be described.

As shown in Figs. 3A and 4A, the first data includes a preamble, an identification code, an ID code, a fixed code, pressure data, temperature data, a status code, A detection code, and a stop bit. The first data is 100-bit data in total.

The ID code is 32-bit data. The ID code is always stored in the transmitter storage unit 25b, and is always the same unless the ID code is changed. Therefore, the ID code is fixed data having a constant value.

The fixed bit is 4-bit data. The fixed bit is, for example, data for calculating an error detecting code. The fixed bit is a predetermined value (fixed value). In addition, the ID codes are different among the four transmitters 21, but the fixed bits are the same.

The pressure data is 12-bit data. The pressure data is data indicative of the pressure detected by the pressure sensor 22, that is, the air pressure of the tire 13. The pressure detected by the pressure sensor 22 fluctuates. Therefore, the pressure data becomes variable data that can take different values.

The temperature data is 8-bit data. The temperature data is data indicating the temperature detected by the temperature sensor 23, that is, the temperature in the tire 13. The temperature detected by the temperature sensor 23 fluctuates. Therefore, the temperature data is variable data that can take different values. In the tire condition monitoring system 20, pressure data and temperature data become payload data, that is, data to be acquired by the receiver 40. [ The payload data is 20 bits, and the number of bits is smaller than that of the ID code.

The status code is 16-bit data. The status data is data indicating the status of the transmitter 21. [ The status code is variable data that can take different values.

The error detection code is 8-bit data. Here, an error detection code is used as a code for error detection, but an error correction code can be used instead of the error detection code. In other words, the code for performing the error detection is an error detection code for performing only error detection and an error correction code for performing error correction in addition to error detection.

As the error detecting code, any error detecting code such as a parity bit, a checksum, and a mirror data may be used. As the error detection code, any error detection code such as a BCH code, an RS code, a Hamming code, a turbo code, or a composite product code may be used.

A checksum is used as the error detection code. The checksum is calculated from the ID code, the fixed bit, the pressure data, the temperature data, and the status code. Since the checksum is 8 bits, the data used for the calculation of the checksum is also set to 8 bits.

As shown in Fig. 4 (a), the 32-bit ID code is divided into four, and the divided data is each 8 bits. 4 (a) shows each of the divided ID codes as ID 1, ID 2, ID 3, and ID 4. 4 (a) shows an example of first data transmitted from the transmitter 21 mounted on the right wheel FR as an example of the first data.

12-bit pressure data is divided into two, and the divided data is 4-bit and 8-bit. 4 (a) shows the data of 4 bits in the divided data and the data of pressure 1 and 8 bits in the divided data. The pressure 1, which is 4-bit data, and the fixed bit of 4 bits are combined to form 8-bit data. More specifically, 8-bit data in which the fixed bit is set to the upper 4 bits and the pressure 1 is set to the lower 4 bits is generated.

The 16-bit status code is divided into two, and the divided data becomes 8 bits each. Fig. 4 (a) shows each of the divided stitut codes with a status 1 and a status 2, respectively.

When generating the transmission data, the transmitter control unit 25 calculates a checksum from the sum of a plurality of data set to 8 bits. The checksum is a value obtained by exclusive ORing the above data.

The preamble is 16-bit data. The identification code is 2-bit data. The stop bit is 2-bit data. The preamble, identification code, and stop bit are, for example, data determined by a protocol. These data are not used for the calculation of the error detection code. 4A and 4B, data strings of data not used for the calculation of the error detection code are omitted.

Next, the second data will be described.

As shown in Figs. 3 (b) and 4 (b), the second data is transmission data in which the ID code and the fixed bit are omitted from the first data. The second data is shorter in length than the first data by an ID code and a fixed bit, and becomes 64-bit data.

As shown in Fig. 4 (b), in the second data, the ID code and the fixed bit are omitted, but the error detecting code used in the same manner as the first data is used. Specifically, as the error detecting code, those calculated from the ID code, the fixed bit, the pressure data, the temperature data, and the Staustus code are used. That is, the second data is the transmission data that includes the ID code and the fixed bit to calculate the error detection code, but does not include the ID code and the fixed bit. 4 (b) shows an example of the second data transmitted from the transmitter 21 mounted on the right wheel FR as an example of the second data.

2, the trigger receiving section 32 receives trigger data transmitted from the triggering device 50 via the receiving antenna 29. [ The trigger data is transmitted as a trigger signal modulated in the trigger device 50. The trigger receiving section 32 demodulates the trigger signal, and outputs the trigger data to the transmitter-use control section 25. The trigger device 50 is a device that causes the transmitter 21 to perform various operations. The transmitter control unit 25 performs various operations in accordance with the trigger data. The trigger data includes, for example, data for requesting transmission of transmission data to the transmitter 21, data for requesting a change in the transmission interval of the transmission data, Data for requesting storage, data for updating the software of the transmitter 21, and the like. The trigger device 50 is prepared, for example, in a factory for manufacturing the transmitter 21, a factory for mounting the transmitter 21 on the wheel 11, a dealer, and the like.

1 and 2, the trigger device 50 includes a plurality of operation portions 51, a trigger device transmission circuit 52, a trigger device reception circuit 53, a display portion 54, A transmission antenna 55 for the trigger device, and a reception antenna 57 for the trigger device. Each operation unit 51 is operated by a user. A plurality of operation units 51 (switches) correspond to operations that can be executed by the transmitter 21, and trigger data requesting an operation in accordance with the operation of the operation unit 51 is transmitted from the trigger device 50.

The operation unit 51 is connected to the trigger unit control unit 55. The control unit for trigger device 55 generates trigger data in accordance with the operation of the operation unit 51. [ As described above, the trigger data includes data for requesting transmission of transmission data to the transmitter 21 or the like.

The control unit for the trigger device 55 outputs the trigger data thus generated to the trigger device transmission circuit 52. The transmitting circuit 52 for the trigger device generates a trigger signal according to the trigger data. The trigger signal is transmitted from the transmitting antenna 56 for the trigger device. The trigger signal is, for example, a signal of LF band (for example, 125 kHz band signal).

The receiving circuit 53 for the trigger device receives the radio signal transmitted from the transmitter 21 via the receiving antenna 57 for the trigger device. The receiving circuit 53 for the trigger device demodulates the radio signal and outputs it to the trigger device control section 55. [

As shown in Fig. 1, the receiver 40 includes a receiver control section 41, a receiver reception circuit 42, and a reception antenna 43. Fig. The receiver control unit 41 is connected to the alarm unit 44. [ The receiver control unit 41 comprises a microcomputer or the like including a CPU 41a for a receiver and a storage unit 41b for a receiver (ROM, RAM, etc.). The receiver circuit 42 demodulates the radio signal received from each transmitter 21 via the receiving antenna 43 and outputs the transmission data to the receiver controller 41. [ And the receiver circuit 42 serves as a receiver.

The receiver control unit 41 recognizes the state of the tire 13 (e.g., the tire air pressure and the temperature in the tire) on the basis of the transmission data from the receiver circuit 42 for the receiver. The receiver control unit 41 notifies an alarm 44 (an alarm) when an abnormality has occurred in the tire 13. [ As the alarm 44, for example, a device for notifying an abnormality by light or flashing of light or a device for notifying an abnormality by sound is used. As the receiver, a portable terminal or the like carried by a passenger of the vehicle 10 can be used.

The receiver storage 41b stores the ID codes and fixed bits of the four transmitters 21 mounted on each wheel 11 of the vehicle 10 on which the receiver 40 is mounted. As a result, the ID code is registered in the receiver 40. The transmitter storage unit 25b and the receiver storage unit 41b store the same ID code, whereby the receiver 40 and the transmitter 21 are associated with each other. The control section 41 for the receiver recognizes only the transmission data transmitted from the four transmitters 21 mounted on the respective wheels 11 of the vehicle 10 on which the receiver 40 is mounted as the transmission data transmitted thereto. Based on the transmission data received by the receiver reception circuit 42 and the ID code stored in the storage 41b for the receiver, the control unit 41 for the receiver determines whether or not the identification information registered in the transmitter 21 (ID code) registered in the receiver 40 with the identification information (ID code) registered in the receiver 40. The control unit 41 for the receiver determines that the transmission data is transmitted from the transmitter 21 associated with the receiver 40 and transmits data (pressure data and temperature data) indicating the state of the tire 13 included in the transmission data, As the data of the vehicle 10 on which the receiver 40 is mounted. The transmission data transmitted from the transmitter 21 registered with the same ID code as the ID code stored in the transmitter 21 corresponding to the receiver 40, that is, the receiver storage 41b is referred to as " Normal data ". In addition, data different from "normal data", that is, transmission data transmitted from a transmitter not associated with the receiver 40 is referred to as "non-regular data".

As described above, the transmitter 21 transmits the first data and the second data as transmission data. In the case where the first data is received as the transmission data and the second data is received, the process performed by the receiver control unit 41 for the verification of the ID code is different.

When the receiver circuit 42 receives the first data, the controller 41 for the receiver acquires the ID code included in the first data and stores the ID code and the ID stored in the receiver storage 41b Contrast the code. Therefore, in the first data, the ID code is the verification data. If any of the ID codes included in the first data and the plurality of ID codes stored in the receiver storage 41b match, the receiver control unit 41 determines the first data as regular data. On the other hand, when neither the ID code included in the first data nor the plurality of ID codes stored in the receiver storage section 41b coincide with each other, the receiver control section 41 determines the first data as the irregular data.

When the receiver circuit 42 receives the second data, the controller 41 for the receiver checks the ID code based on the error detection code included in the second data. Therefore, in the second data, the error detection code is the verification data. When the receiver circuit 42 receives the second data, the controller 41 for the receiver computes the error detection code from the second data, the ID code stored in the receiver memory 41b, and the fixed bit. The calculation of the error detection code is performed in the same manner as in the case of the transmitter 21. That is, the transmitter storage unit 25b and the receiver storage unit 41b store the program to calculate the error detection code in the same manner.

The receiver control unit 41 adds the ID code and the fixed bit stored in the receiver storage unit 41b to the pressure data, the temperature data, and the status code included in the second data to calculate an error detection code of 8 bits . Since the receiver storage 41b stores four ID codes corresponding to the four wheels 11, four error detecting codes are calculated. When the ID code (and the fixed bit) of the transmitter 21 coincides with the ID code (and the fixed bit) registered in the receiver 40, the error detection code included in the second data and the control code for the receiver 41, And the error detection code calculated in the above equation are the same. More specifically, in the calculation of the error detecting code, the calculations are performed in the same manner in the transmitter 21 and the receiver 40. Of the data used for the calculation of the error detecting code, the pressure data, the temperature data, and the status code are the same unless an error occurs. Further, when the ID code matches in the transmitter 21 and the receiver 40 that have transmitted the transmission data, the ID code (and fixed bit) also coincides with each other, and the same calculation is performed using the same data. Then, the error detection code which is the calculation data calculated by the transmitter 21 and the receiver 40 coincides with each other. Therefore, the ID code of the transmitter 21 and the ID code of the receiver 40 can be identified by checking the coincidence between the error detection code, which is the calculation data included in the second data, and the error detection code calculated by the receiver control unit 41, Can be collated.

5, the receiver storage unit 41b corresponding to the right wheel FR, the left front wheel FL, the rear right wheel RR, and the left rear wheel RL stores four ID codes It is assumed to remember.

6, when an error detecting code (check sum) is calculated using the ID code corresponding to the right wheel FR, the left wheel FL, the rear wheels RR, and the left wheel RL, The error detection code calculated by using the ID code corresponding to the error detection code FR coincides with the error detection code included in the second data.

When either the error detection code included in the second data matches the error detection code calculated by the control unit 41 for the receiver, the receiver control unit 41 determines the second data as regular data. On the other hand, when neither the error detection code included in the second data nor the error detection code calculated by the control unit 41 for the receiver coincide with each other, the receiver control unit 41 judges the second data as irregular data.

And the receiver control unit 41 functions as an acquisition unit for acquiring the verification data and the variable data from the transmission data. Further, the receiver control unit 41 functions as a verification unit for performing verification from the verification data and the ID code stored in the receiver storage unit 41b. The acquisition unit (acquisition means) and the verification unit (verification unit) are realized as functions of the control unit 41 for the receiver.

In addition to the ID code, the control unit 41 for the receiver also calculates the error detecting code by including a fixed bit. This is because the transmitter controller 25 also includes a fixed bit to calculate the error detection code. That is, the data used in the calculation of the error detecting code, but not included in the second data is not limited to the ID code alone. An ID code and a fixed bit, or an ID code. The data not included in the second data is stored in the receiver storage section 41b as a fixed value (fixed data) including at least the ID code, and is used for the calculation of the error detecting code Data that can be used is just that. The ID code and the fixed bit may be regarded as fixed data.

The receiver control unit 41 can recover the ID code of the transmitter 21 from the error detection code. As described above, when the error detection code included in the second data matches the error detection code calculated by the control unit 41 for the receiver, the ID code used for the calculation of the error detection code is It can be estimated that it is the ID code of the transmitter 21. Therefore, the error detection code as the calculation data can restore the ID code to the receiver control unit 41 and can recognize the restored data having a shorter length than the ID code. The first data and the second data may be distinguished from each other by a difference in data length between the first data and the second data. Further, the transmitter 21 may change the identification code to first data and second data, and the receiver control section 41 may distinguish the first data and the second data from the identification code.

If the ID code of the transmitter 21 that has transmitted the transmission data and the ID code that is registered in the receiver 40 are collated using the second data, the ID code registered in the transmitter 21 and the ID code registered in the receiver 40 The error detection codes may coincide with each other even though the registered ID codes do not match.

This is caused by the difference between the data length of the ID code and the data length of the error detecting code. Since the data length of the ID code is 32 bits, the ID code has 2 ^ 32 data strings (bit strings). On the other hand, since the error detection code is 8 bits, there is only 2 ^ 8 data sequence (bit sequence) in the error detection code. That is, the combination of error detection codes is smaller than the combination of ID codes. Due to this, according to the value of the variable data, the error detection code coincides with the ID code registered in the transmitter 21 and the ID code registered in the receiver 40.

Therefore, when the error detection code is calculated using the ID code, there exist a plurality of ID codes for calculating the same error detection code. For example, the data (binary number) of ID 2 which is the data obtained by dividing the ID code of the left-after wheel RL among the ID codes shown in Fig. 6 is changed from "00000010" to "01000011". In this case, the error detecting code calculated using the ID code corresponding to the right wheel FR and the error detecting code calculated using the ID code corresponding to the left wheel RL become the same value. Therefore, when the ID code is recognized (restored) from the error detecting code included in the second data, there is a fear that the ID code having the error is recognized (restored). In the above example, it is impossible to specify whether the ID code of the transmitter 21 that transmitted the second data is an ID code corresponding to the right wheel FR and an ID code corresponding to the left wheel RL. That is, it can not specify whether the transmission data is transmitted from the transmitter 21 mounted on the right wheel FR, or transmitted from the transmitter 21 mounted on the left-rear wheel RL.

It is also assumed that there is another vehicle mounted with the same tire condition monitoring system 20 as the present embodiment in the vicinity of the vehicle 10. [ The error detection code included in the second data transmitted from the transmitter mounted on another vehicle may coincide with the error detection code calculated by the receiver 40. [ Then, there is a possibility that the second data transmitted from the transmitter mounted on another vehicle may be misinterpreted as regular data.

As described above, the first data is data capable of recognizing the correct ID code of the transmitter 21 to the receiver 40 unless the first data has a long data length and an error is not generated in the first data. On the other hand, the second data is transmission data which is short in data length but can not accurately recognize the ID code of the transmitter 21 in the receiver 40.

By switching the first state in which the first data is transmitted and the second state in which the second data is transmitted, the power consumption of the battery 30 can be reduced and the ID code can be accurately In order to recognize the ID code, it is possible to recognize the ID code correctly.

As shown in Fig. 7, in step S10, the transmitter control unit 25 determines whether or not a specific condition is established. When the specific condition is not satisfied (NO), the transmitter control unit 25 enters the first state in which the first data is transmitted (step S20). When the specific condition is satisfied (YES), the transmitter control unit 25 enters the second state in which the second data is transmitted (step S30). The transmitter control unit 25 functions as a control unit for switching to the first state or the second state. That is, a data generation unit (data generation means) for generating data and a control unit (control means) for switching the data generation unit to the first state or the second state function as the transmitter control unit 25. That is, the transmitter control unit 25 has a function of generating first data, a function of generating second data, and a function of switching the first state or the second state.

The specific condition is whether the number of processes performed by the transmitter control unit 25 exceeds the processing threshold value calculated from the counting time point. The transmitter storage unit 25b stores a program for counting the number of processing times and for determining whether or not the processing time count processing threshold value has been exceeded. The counting time may be reset at the time of manufacture of the transmitter 21 (when the transmitter 21 is started) or when the trigger device 50 transmits the trigger signal. That is, the counting time can be determined by the trigger data.

Examples of the processing include a transmission processing, a measurement processing, a time processing, a traveling time measurement processing, a travel determination processing, and a reception processing. The processing threshold value may be stored in advance in the transmitter storage unit 25b or may be settable by the trigger device 50. [

The transmission processing is processing for transmitting transmission data to the receiver 40. [ The measurement processing is processing for measuring the detection values of the sensors 22, 23, 24, and 31 (obtaining outputs from the sensors 22, 23, 24, and 31). The counting process is a process of adding time by the counting function of the transmitter controller 25 (an increment process of the counter).

The running time measurement process is a process for measuring the running time of the vehicle 10. [ As described above, the transmitter control unit 25 acquires the acceleration detected by the acceleration sensor 24 at a predetermined acquisition interval, and determines whether the vehicle 10 is running or stopped. The running interval can be measured by multiplying the number of times that the acceleration is judged to exceed the threshold for judging driving judgment by the obtaining interval.

The running determination process is a process for measuring the number of times the vehicle 10 has been run and stopped. By measuring the number of times the acceleration detected by the acceleration sensor 24 has reached the running determination threshold value, It is possible to measure the number of times the stop has been performed.

The reception processing is processing for receiving the trigger signal.

The process counted to determine whether or not a specific condition is established may be any one of a plurality of processes as described above, or may be a plurality of processes. In the case of one process, it is determined that the specific condition is satisfied when the number of times that one process has been performed exceeds a predetermined processing threshold value.

In the case of a plurality of processes, a separate process threshold value is set for each of a plurality of processes. The transmitter control unit 25 can determine that a specific condition has been satisfied when a number of processes equal to or greater than the processing threshold value has been performed for all of the plurality of processes and that the processing for two or more of the plurality of processes It is possible to judge that the specific condition is satisfied when the number of times of the processing threshold value is greater than the processing threshold value. That is, when the number of times that a plurality of processes are performed is individually counted and the establishment of a specific condition is determined based on the number of times a plurality of processes are performed, whether or not the number of times of processing thresholds or more It is possible to judge whether or not a specific condition is established based on the information. Any number may be stored in advance in the transmitter storage section 25b and may be set by the trigger device 50. [

As the processing threshold, a value is set such that a specific condition is established after the transmitter 21 is manufactured (after startup) and the transmitter 21 is mounted on the wheel 11. [ That is, the first data is transmitted from the transmitter 21 at least at a factory where the transmitter 21 is mounted on the wheel 11. In the factory for manufacturing the transmitter 21 or the factory for mounting the transmitter 21 on the wheel 11, the ID code is registered by the trigger device 50. At this time, it is confirmed whether or not the ID code is stored in the transmitter storage section 25b. The confirmation operation is performed by transmitting the transmission data to the transmitter 21, receiving the transmission data at the trigger device 50, and confirming the ID code contained in the received transmission data. The ID code of the transmitter 21 can not be registered in the trigger device 50 that receives the transmission data transmitted from the unspecified number of transmitters 21. [ Therefore, even when the trigger device 50 receives the second data, it can not recognize the ID code from the second data. Further, even if the ID code can be guessed from the second data by registering the ID code in the household item triggering device 50, the ID code may not be accurate as described above. Therefore, it is necessary to transmit the first data to the transmitter 21 when confirming the ID code registered in the transmitter 21.

When the ID code is registered in the receiver 40, that is, when the receiver 40 and the transmitter 21 are associated with each other, transmission data is transmitted from the transmitter 21 to the receiver 40, And stores the ID code in the receiver storage 41b. When the ID code is registered in the receiver 40, since the receiver storage 41b does not store the ID code, the ID code can not be recognized even when the second data is received. It is necessary to transmit the first data to the transmitter 21 when registering the ID code in the receiver 40. [

The processing from step S10 to step S30 is performed periodically. The number of times of processing increases as the vehicle 10 travels or elapses. Therefore, when the number of processing times becomes equal to or larger than the processing threshold value, the number of times the processing is performed does not become less than the threshold value, except when the number of processing times is reset. That is, once the specific condition is established, the transmitter controller 25 is maintained in the second state.

The specific condition can be made invalid again by a command (resetting of the counting time point) by the triggering device 50. [

When the sensors 22, 23, 24, and 31 determine that the sensors 22, 23, 24, and 31 have failed, the transmitter control unit 25 switches the second state to the first state by resetting the number of times the processing has been performed. When the sensors 22, 23, 24, and 31 fail, the trigger data is transmitted for the purpose of confirming the operation of the sensors 22, 23, 24, and 31. At this time, the first data is transmitted so that the ID code of the transmitter 21 can be confirmed.

When the specific condition is satisfied and the transmitter controller 25 switches to the second state, the transmitter 21 transmits the second data. The transmission of the second data is, for example, after the vehicle 10 having the transmitter 21 is distributed to the market. Since the ID code is registered in both the transmitter 21 and the receiver 40 after the vehicle 10 is circulated on the market, registration of the ID code by the trigger device 50 and registration of the ID code to the receiver 40 It is not necessary to transmit the ID code for the ID code.

As described above, there is a case where the error detection code included in the second data matches the error detection code calculated by the control unit 41 for the receiver. In other words, the ID code of the transmitter 21 may not be confirmed. In this case, the second data including the error detecting code is not treated as normal data. That is, the pressure data and the temperature data included in the second data are not used as data indicating the state of the tire 13 on which the receiver 40 is mounted. The second data is regarded as regular data only when one of the error detection codes included in the second data matches the error detection codes calculated by the receiver control unit 41. [

The error detection code included in the second data is compared with the possibility that a plurality of error detection codes included in the second data coincide with a plurality of error detection codes calculated by the receiver control unit 41, There is a high possibility that one of the error detection codes coincides. Also, the second data is periodically transmitted. Therefore, in the case where an error detecting code that coincides with a plurality of error detecting codes calculated by the receiver 40 occurs accidentally, even if the second data including the error detecting code is not treated as normal data, Data indicating the state of the tire 13 can be obtained from the normal data.

Further, as described above, when the receiver 40 receives the second data transmitted from the transmitter mounted on the vehicle different from the vehicle 10, the receiver 40 can misidentify the irregular data as the normal data. However, when comparing the probability of misinterpreting the irregular data as the regular data and the probability of not mistaking the irregular data as the normal data, the probability of misidentifying the irregular data as the normal data is low. Since the transmission data (second data) is transmitted periodically, even if misjudgment is made to normal data, errors (information on the air pressure data and temperature data) are updated by receiving the normal data to be transmitted thereafter.

As described above, even when the second data is used for transmission and reception, the tire state monitoring system 20 is considered to have no trouble in actual use.

Next, the operation of the transmitter 21, the receiver 40, and the tire condition monitoring system 20 will be described.

The transmitter 21 transmits the first data or the second data. The receiver 40 can collate the ID code even when the first data is received or the second data is received. Accordingly, the tire condition monitoring system 20 including the transmitter 21 and the receiver 40 can transmit and receive both the first data and the second data.

In the tire condition monitoring system 20, the transmission data transmitted from the transmitter 21 and the rotation position of the wheel 11 by the anti-lock braking system (ABS) It is possible to automatically recognize to which of the wheels 11 the transmitter 21 is mounted. The tire condition monitoring system 20 that transmits and receives data by using the second data can automatically recognize to which of the four transmitters 21 the transmitter 21 is attached to which of the wheels 11. [

Therefore, according to the above embodiment, the following effects can be obtained.

1) When the controller 25 for the transmitter is in the second state, the second data is transmitted to the receiver 40. The second data includes an error detection code having a data length shorter than the ID code as demodulation data for performing a verification with the receiver control unit 41. [ The data length of the verification data becomes shorter than when the data obtained by exclusive ORing the ID code and the variable data is used as demodulated data. Particularly, the ID code occupies a large proportion in the entire transmission data, and the data length of the transmission data tends to become long due to the data length of the ID code. By using the second data omitting the ID code, the data length of the entire transmission data can be shortened, and the power consumption required for transmission of the transmission data (second data) is reduced. Therefore, the life of the battery 30 can be increased.

2) When the controller 25 for the transmitter is in the first state, the first data is transmitted to the receiver 40. The first data includes the ID code itself as the verification data for performing the verification on the control section 41 for the receiver of the receiver 40. [ This makes it possible to accurately recognize the ID code in the receiver 40 or the trigger device 50. [ Therefore, when it is necessary to recognize the ID code in the receiver 40 or the trigger device 50, transmission data including the ID code can be transmitted.

In other words, by making the transmitter controller 25 switchable to the first state or the second state, the format of the transmission data can be changed as necessary.

3) A code (error detection code) for error detection is used as calculation data. The error detection code is calculated even when the error detection code is not used as the verification data. By using this error detection code as calculation data, it is possible to shorten the data length.

4) The transmitter 21 is mounted on the wheel 11. The transmitter 21 detects the state of the tire 13 of the mounted wheel 11 and transmits the detected data to the receiver 40. [ The detected value detected by the pressure sensor 22 or the temperature sensor 23 varies depending on the running state, the surrounding environment, and the measurement error. Therefore, the data indicating the detected value can be used as the variable data, and the error detecting code can be calculated. The data indicating the detected value is payload data, which is necessarily transmitted to the receiver 40. Therefore, the data length can be reduced compared with the case where the error detection code is calculated using the variable data that is not required to be acquired by the receiver 40. [

Further, it is difficult or impossible to replace the battery 30 in the transmitter 21 mounted on the wheel 11. The battery 30 can not be exchanged in the transmitter 21 housing the electronic parts such as the pressure sensor 22 and the battery 30 in the case and potting the inside of the case. Even if the used battery 30 is a replaceable transmitter 21, the transmitter 21 needs to separate the tire 13 from the wheel 12 in order to exchange the battery 30 in relation to being disposed in the tire 13 have. For this reason, it is particularly required to increase the service life of the transmitter 21 mounted on the wheel 11. [

Further, by increasing the lifetime of the battery 30, it is possible to reduce the replacement frequency of the battery 30 in the transmitter 21 in which the battery 30 can be exchanged. Therefore, the hassle of the owner of the vehicle 10 can be alleviated. Further, it is possible to increase the lifetime of the replaceable transmitter 21 itself by means of the battery 30.

5) The transmitter control unit 25 switches from the first state to the second state when the number of processing times becomes equal to or greater than the processing threshold value. The number of processing increases with time. The transmitter control unit 25 becomes the first state only for the period until the number of processing times becomes equal to or higher than the processing threshold value and becomes the second state after this period elapses. It is possible to reduce the power consumption of the battery 30 by transmitting the first data only during a period in which it is assumed that it is necessary to transmit the first data.

6) Even when the receiver circuit 42 receives the first data, even if the second data is received, the controller 41 for the receiver sets the ID code of the transmitter 21, which has transmitted the transmission data, 40) can be collated with each other. Therefore, the transmitter 21 that transmits the error detection code as the verification data can be used in association with the receiver 40. [ That is, the transmitter 21 that transmits the second data can be used by using the receiver 40 capable of checking the ID code with the second data, and the life of the battery 30 of the transmitter 21 can be increased have.

7) The receiver 40 receives the transmission data transmitted from the transmitter 21 mounted on the wheel 11. [ Since the vehicle 10 includes a plurality of wheels 11, it also includes a plurality of transmitters 21 in the same manner. A receiver (40) receives transmission data transmitted from a plurality of transmitters (21). Since the receiver storage 41b stores the ID codes of the plurality of transmitters 21, it is confirmed that the ID codes of the transmitter 21 and the ID codes stored in the receiver storage 41b match It can be determined whether or not the transmission data is regular data.

8) The data length of the second data is shorter than that of the first data. Therefore, compared with the first data, the second data is less susceptible to errors in data (sign) until it is received by the receiver circuit 42 for receiving.

9) The second data does not include the ID code itself. In the case of receiving the second data, in order to specify the ID code from the second data, it is necessary to check the ID code of the transmitter 21 that has transmitted the second data. Therefore, even when the receiver other than the receiver 40 mounted on the vehicle 10 receives the second data, the ID code of the transmitter 21 can not be confirmed from the second data. The leakage of the ID code from the second data is prevented and the security of the transmitter 21 is improved.

10) The tire condition monitoring system 20 including the transmitter 21 and the receiver 40 can transmit and receive data even when the first data is used as the transmission data and the second data is used. Therefore, the tire condition monitoring system 20 can obtain the effects described in the above 1) to 9).

(Second Embodiment)

Hereinafter, a second embodiment of a transmitter, a receiver, and a transmission / reception system will be described. In the following description, the same components as those of the transmitter, the receiver, and the transmission / reception system of the first embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

As shown in Fig. 8, the format of the transmission data (frame format) differs from that of the first embodiment in the second embodiment. As shown in Fig. 8, the transmission data of the second embodiment includes a shuffle pattern instead of a fixed bit. 8 shows an example of transmission data transmitted from the transmitter 21 mounted on the right wheel FR as an example of transmission data.

The shuffle pattern is 4-bit data. The random pattern (value) may change in the shuffle pattern, and a predetermined pattern (value) may be changed every transmission of the transmission data. In other words. The shuffle pattern may be any value as long as it is not always constant. The shuffle pattern is variable data.

Here, the shuffle pattern is data for shuffling (sorting) an ID code, and defines a rule for specifying an ID code to be shuffled. The transmitter control unit 25 changes the ID code according to the shuffle pattern when transmitting the transmission data. Each bit of the shuffle pattern corresponds to ID 1, ID 2, ID 3, and ID 4. Specifically, the lowest bit of the shuffle pattern corresponds to ID 1, the bit of 1 higher than the lowest bit corresponds to ID 2, the bit of 1 lower than the most significant bit corresponds to ID 3, and the most significant bit corresponds to ID 4.

ID 4, ID 2, and ID 3 are shuffled according to whether each bit is "0" or "1" among the 4-bit shuffle patterns represented by binary numbers. Here, '0' means no shuffle, and '1' means shuffle. In addition, the upper 4 bits and the lower 4 bits of ID 1 to ID 4 are changed.

For example, in FIG. 8, the shuffle pattern is 1100. Since the first higher bit of the least significant bit and the most significant bit is 0, data of ID 1 and ID 2 corresponding to these bits are not shuffled. Since the one lower bit of the most significant bit and the most significant bit is 1, the data of ID 3 and ID 4 corresponding to these bits are shuffled. The rule (program) determined according to the shuffle pattern is stored in the transmitter storage section 25b.

The first data of the second embodiment is data including a preamble, an identification code, an ID code (after shuffling), a shuffle pattern, pressure data, temperature data, a status code, an error detection code and a stop bit. The ID code referred to here is an ID code after being shuffled according to a rule determined by a shuffle pattern. Further, the error detection code is calculated from the ID code, the shuffle pattern, the pressure data, the temperature data, and the status code after being shuffled according to the rule determined by the shuffle pattern.

The second data of the second embodiment is data including a preamble, an identification code, a shuffle pattern, a pressure data, a temperature data, a status code, an error detection code, and a stop bit. The error detection code is calculated from the ID code, the shuffle pattern, the pressure data, the temperature data, and the status code after being shuffled according to the rule determined by the shuffle pattern. That is, the transmission data in which the ID code is omitted from the first data becomes the second data. The second data is 68-bit data.

When the receiver circuit 42 receives the first data, the controller 41 for the receiver shuffles the ID code stored in the receiver memory 41b from the shuffle pattern included in the first data. The rule (program) determined according to the shuffle pattern is stored in the receiver storage 41b. The rule stored in the receiver storage unit 41b is the same as the rule stored in the transmitter storage unit 25b. That is, the upper and lower 4 bits of ID 1 to ID 4 corresponding to '1' among the bits of the shuffle pattern are changed. As a result, the ID code stored in the receiver storage 41b is shuffled in the same rule as the first data, so that the ID code included in the transmission data can be collated with the ID code stored in the receiver storage 41b .

When the receiver reception circuit 42 receives the second data, the receiver control unit 41 calculates the error detection code from the ID code stored in the second data and receiver storage unit 41b. The calculation of the error detection code is performed in the same manner as in the case of the transmitter 21.

The receiver control section 41 adds the ID code stored in the receiver storage section 41b to the shuffle pattern, the pressure data, the temperature data, and the status code included in the second data to calculate an error detection code of 8 bits. At this time, the ID code used in the calculation is shuffled according to the rule determined by the shuffle pattern. The same rule as that of the transmitter 21 is defined by the rule determined by the shuffle pattern.

In this way, when the ID codes match in the transmitter 21 and the receiver 40 that have transmitted the transmission data, the same calculations are performed in the transmitter control unit 25 and the receiver control unit 41. Therefore, the ID code of the transmitter 21 can be collated with the ID code of the receiver 40 by confirming the coincidence between the error detecting code included in the second data and the error detecting code calculated by the receiver control unit 41 .

By shuffling the ID code according to the shuffle pattern, the calculated error detection code changes. In the example shown in Fig. 9, when ID1 to ID4 are not shuffled according to the shuffle pattern, the error detection code calculated using the ID code corresponding to the right wheel FR and the ID code The calculated error detection codes are the same. On the other hand, when ID 1 to ID 4 are changed in accordance with the shuffle pattern, the error calculated by using the ID code corresponding to the right wheel FR and the ID code corresponding to the left wheel RL The detection codes do not have the same value. IDs 1 to 4 in Fig. 9 represent data after shuffling according to the shuffle pattern.

Therefore, according to the second embodiment, in addition to the effects of 1) to 10) described in the first embodiment, the following effects can be obtained.

11) By shuffling the ID code according to the shuffle pattern, a plurality of the error detection codes included in the second data and the error detection codes calculated by the receiver control unit 41 are prevented from coinciding. Therefore, by using the shuffle pattern, it is easy for the receiver control section 41 to recognize the ID code of the transmitter 21 that has transmitted the second data.

12) The ID code is also shuffled when transmitting the first data. Therefore, even when the receiver other than the receiver 40 mounted on the vehicle 10 receives the first data, the ID code of the transmitter 21 can not be recognized from the first data. The leakage of the ID code from the first data is prevented, and the security of the transmitter 21 is improved.

(Third Embodiment)

Hereinafter, a third embodiment of a transmitter, a receiver, and a transmission / reception system will be described. In the following description, the same components as those of the transmitter, the receiver, and the transmission / reception system of the first embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

In the third embodiment, the processing for switching the transmitter controller 25 to the first state or the second state is different from the first embodiment. In the first embodiment, the first state and the second state are switched according to the number of processing as a specific condition. On the other hand, in the case of the third breathing mode, the first state and the second state are switched according to the detection value of the sensor as a specific condition. Hereinafter, this will be described in detail.

The specific condition is whether the detected value is equal to or greater than a predetermined threshold value or less than a threshold value. The threshold value may be stored in the transmitter storage unit 25b in advance and may be settable by the trigger device 50. [ As described above, the transmitter control unit 25 acquires the detection values detected by the pressure sensor 22, the temperature sensor 23, the acceleration sensor 24, and the voltage sensor 31 at a predetermined acquisition interval . The transmitter control unit 25 switches the first state and the second state based on whether these detected values are more than threshold value or less than threshold value.

(The first state) when the pressure is less than the predetermined threshold, and when the pressure is equal to or greater than the threshold value, the condition is established (the second state) when the pressure is less than the predetermined threshold, .

When the transmitter 21 is mounted on the wheel 11, the transmitter 21 is mounted on the wheel 11 and then the trigger data is transmitted to the transmitter 21 to confirm the operation. Upon receiving the trigger data, the transmitter 21 transmits (carries) transmission data including various data. At this time, when the trigger device 50 confirms the ID code of the transmitter 21 that has transmitted the transmission data, the first data needs to be transmitted. After confirming the operation of the transmitter 21, air is injected into the tire 13. Therefore, when the pressure becomes equal to or higher than the threshold value, air is injected into the tire 13 after the operation of the transmitter 21 is confirmed. In this state, since the operation confirmation is already finished and the necessity of receiving the ID code by the trigger device 50 is low, the first state is switched to the second state.

In order to accurately identify the ID code in the receiver 40 when the abnormality occurs in the tire 13 and the pressure becomes less than the threshold value, The transmitter control unit 25 switches the second state to the first state so that the position can be specified. As a threshold value, a value that can determine that air is injected into the tire 13 is set. For example, the threshold value is set to a value of 80% of the designated air pressure which is the air pressure recommended for the tire 13, and the like.

In the case where the first state and the second state are switched using the acceleration as the detection value, the specific condition is not established (the first state) when the acceleration is less than the predetermined value, and when the acceleration is the threshold value or more, State).

The transmitter 21 is in a state after the vehicle 10 is mounted on the wheel 11 and the vehicle 10 mounted with the transmitter 21 is circulated on the market. In this state, the factory judges that the use of the trigger device 50 is ended, such as checking the operation of the transmitter 21, and switches the first state to the second state. Therefore, a threshold value for determining whether or not the vehicle 10 is running or stopping is set as the threshold value. The trigger device 50 is often used in a state where the vehicle 10 is stopped. Therefore, when the vehicle 10 is stopped, there is a possibility of receiving the trigger data, so that the ID code is specified to the trigger device The transmitter control unit 25 switches the second state to the first state.

(First state) when the temperature is equal to or higher than the predetermined threshold, and when the temperature is lower than the threshold value (second state) when the temperature is equal to or higher than the predetermined threshold, .

If the battery 30 is discharged in a state in which the environmental temperature such as the winter season is remarkably low, the life of the battery 30 is lowered. In the first state, since the power consumption of the battery 30 is greater than the second state, when the temperature is lower than the threshold value, the transmitter controller 25 is set to the second state, thereby preventing the battery 30 from deteriorating in service life. The threshold value is set to a value at which it can be judged that the environmental temperature such as freezing point is considerably low.

(First state) when the voltage is equal to or greater than a predetermined threshold, and when the voltage is less than the threshold value (second state) when switching the first state and the second state using the voltage as the detection value, .

The voltage of the battery 30 is lowered as the remaining capacity of the battery 30 is lowered. When the remaining capacity of the battery 30 is reduced, the first state and the second state are set in order to increase the life of the battery 30. The threshold voltage is set when the remaining capacity of the battery 30 significantly decreases.

Also, the transmitter controller 25 can switch between the first state and the second state based on a plurality of detection values among the detection values. That is, when one of the conditions for establishing the specific condition according to the detected values is satisfied, it is determined that the specific condition of step S10 is satisfied, and if all the specific conditions are satisfied, the specific condition of step S10 is satisfied You can judge. It is also possible to determine that the specific condition of step S10 is satisfied when a plurality of (except all) specific conditions are satisfied among the conditions for establishing the specific condition according to the detected values.

Therefore, in addition to the effects of 1) to 10) described in the first embodiment, the following effects can be obtained.

13) The transmitter control unit 25 switches between the first state and the second state according to the detection values of the sensors 22, 23, 24, and 31 provided in the transmitter 21. The transmitter 21 acquires detection values at predetermined intervals to monitor the state of the tire 13 and the state of the transmitter 21. [ By switching the first state and the second state using this detection value, it is possible to switch between the first state and the second state by using the detection value for monitoring the state of the tire 13 or the state of the transmitter 21 . Therefore, it is not necessary to acquire the detection value only to switch between the first state and the second state, and it is possible to prevent the power consumption of the battery 30 from increasing.

(Fourth Embodiment)

Hereinafter, a fourth embodiment of a transmitter, a receiver, and a transmission / reception system will be described. In the following description, the same components as those of the transmitter, the receiver, and the transmission / reception system according to the first embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

The transmitter control unit 25 of the fourth embodiment controls so that both the first data and the second data are periodically transmitted. Further, the transmitter controller 25 transmits the second data at a higher frequency than the first data. The first data is transmitted at a lower frequency than the second data.

For example, the first state and the second state of the transmitter control unit 25 can be switched at predetermined intervals. In this case, the interval from the first state to the second state is shorter than the interval from the second state to the first state. Thereby, the second data can be transmitted at a higher frequency than the first data.

Further, when transmitting the transmission data, whether the first data is transmitted or the second data is transmitted can be determined at random. In this case, by making the probability that the first data is transmitted lower than the probability that the second data is transmitted, the second data is transmitted at a higher frequency than the first data.

It is also possible to transmit the first data a predetermined number of times after the vehicle 10 becomes the start state (ignition switch ON state) by the start switch (ignition switch) of the vehicle 10 and transmit the first data a predetermined number of times The second data can be transmitted. Similarly, after transmitting the first data a predetermined number of times after the vehicle 10 is stopped (ignition switch OFF state) by the start switch (ignition switch) and transmitting the first data a predetermined number of times, Data may be transmitted. For example, the number of times that the first data can be reliably received even under an environment in which it is difficult for the receiver 40 to receive the first data due to the influence of the communication environment or the like.

Therefore, in addition to the effects of 1) to 10) described in the first embodiment, the following effects can be obtained.

14) The transmitter control unit 25 periodically transmits both the first data and the second data so that the receiver control unit 41 periodically confirms whether the ID code stored in the receiver storage unit 41b is correct or not have. In addition, by transmitting the second data at a higher frequency than the first data, an increase in the power consumption of the battery 30 due to the transmission of the first data can be suppressed.

(Fifth Embodiment)

Next, a fifth embodiment of a transmitter, a receiver, and a transmission / reception system will be described. 10, the vehicle communication system 60 as a transmission / reception system includes a transmitter 61 and a receiver 70. [ The vehicle communication system 60 is a keyless entry system. The keyless entry system is a system for locking or unlocking a door of a vehicle by receiving transmission data transmitted from a transmitter 61 (electronic key) to a receiver 70 mounted on the vehicle.

The transmitter 61 includes a lock switch 62 operated when the door is locked, an unlock switch 63 operated when the door is unlocked, a key control unit 64, a transmission circuit 65, a transmission antenna 66, As shown in Fig.

The lock switch 62 and the unlock switch 63 are operated to output an electric signal to the key control section 64. [

The control unit 64 for the key as the data generating unit and the control unit is composed of a microcomputer or the like including a CPU and a key storage unit 67 (RAM, ROM, etc.). The key storage unit 67 serving as a transmitter storage unit stores an ID code which is data representing identification information unique to the transmitter 61. [ The key storage unit 67 also stores various programs for controlling the transmitter 61. [ The program includes a program for switching the sun of the transmission data transmitted from the transmitter 61 and the like.

The key control unit 64 can recognize that the lock switch 62 and the unlock switch 63 have been operated by inputting the electric signal from the lock switch 62 and the unlock switch 63. [ Also, the key control section 64 can detect the time when the unlock switch 63 is operated. That is, the key control unit 64 can determine whether or not the unlock switch 63 has been operated for a predetermined time or longer, or make a so-called long press determination.

The key control unit 64 generates transmission data according to the operation of the lock switch 62 and the unlock switch 63. [ The transmission data includes door data relating to the operation of the door as payload data. The door data includes data indicating a lock command requesting the door to be locked, data indicating an unlock command requesting the unlocking of the door, and data indicating a doorway command requesting the opening of the slide door.

When the lock switch 62 is operated, the key control unit 64 generates transmission data including data indicating a lock command. When the unlock switch 63 is operated, the key control section 64 generates transmission data including data indicating the unlock command. When the unlock switch 63 has been operated for a predetermined time or longer (long depressed), the control unit 64 for key generates transmission data including data indicating the doorway command. The door data is variable data that can take different values by the operation of the lock switch 62 and the unlock switch 63. [

Among the data included in the transmission data, data other than door data include a preamble, an ID code, and a rolling code. The rolling code is variable data. Like the transmitter controller 25 described in the first embodiment, the key controller 64 calculates the error detection code from the ID code, which is fixed data, and each variable data.

The key control unit 64 switches to the first state or the second state. The first data transmitted in the first state includes an ID code. The second data transmitted in the second state is data in which the ID code is omitted from the first data. The key control section 64 outputs the generated transmission data to the transmission circuit 65. The transmission circuit 65 modulates transmission data. The modulated transmission data is transmitted from the transmission antenna 66 as a radio signal. The radio signal is transmitted, for example, as a UHF band signal.

For example, the first state and the second state can be switched depending on whether or not the number of processes performed by the key control unit 64 exceeds the processing threshold value. The processing includes, for example, transmission processing. The transmission process is a process of transmitting transmission data.

The receiver 70 includes a receiving antenna 71, a receiving circuit 72, and a keyless control unit 73. The receiver 70 is connected to a vehicle control device 74 mounted on the vehicle. The vehicle control device 74 controls various devices mounted on the vehicle. The vehicle control device 74 is connected to the door lock device 75. The door lock device 75 is a device for locking and unlocking the door.

The keyless control unit 73 is composed of a microcomputer or the like including a CPU and a keyless storage unit 76 (ROM, RAM, etc.). The receiving circuit 72 demodulates the radio signal received via the receiving antenna 71 and outputs the transmission data to the keyless controller 73. [ The receiving circuit 72 functions as a receiving section. The keyless storage unit 76 as a transmitter storage unit stores the ID code of the transmitter 61 associated with the receiver 70. [ In the keyless entry system, the keyless storage unit 76 stores one ID code.

The keyless control unit 73 serving as the verification unit and the acquisition unit collates the ID code of the transmitter 61 with the ID code stored in the keyless storage unit 76. [ When the ID code of the transmitter 61 that has transmitted the transmission data matches the ID code stored in the keyless storage unit 76, the keyless control unit 73 transmits the door data acquired from the transmission data to the vehicle control device 74). The vehicle control device 74 grasps the request from the transmitter 61 from the door data. When the vehicle control device 74 receives the lock command, it controls the door lock device 75 to lock the door. The vehicle control device 74 releases the door by controlling the door lock device 75 upon receiving the unlock command. When the vehicle control device 74 receives the door opening instruction, it opens the slide door by controlling a door opening mechanism (not shown).

The process performed by the keyless control unit 73 when collating the ID code of the transmitter 61 with the ID code stored in the keyless storage unit 76 is the same as that of the receiver control unit 41 described in the first embodiment, . When the receiving circuit 72 receives the first data, the keyless control section 73 collates the ID code included in the first data with the ID code stored in the keyless storage section 76. When the receiving circuit 72 receives the second data, the keyless controller 73 calculates the error detecting code in the same manner as the transmitter 61, and outputs the error detecting code included in the second data and the keyless- The ID code is verified based on whether or not the error detection codes calculated by the error detection code generation unit 73 match.

Therefore, according to the above embodiment, the following effects can be obtained.

15) As with the transmitter 21 used in the tire condition monitoring system 20, the transmitter 61 used in the vehicular communication system 60 can also extend the service life of the battery 30.

The above-described embodiments can be modified as follows.

In the second embodiment, it is possible to appropriately change the rule determined according to the shuffle pattern, that is, how to shuffle the ID code. For example, instead of changing the upper 4 bits and the lower 4 bits of ID 1 to ID 4, each bit of ID 1 to ID 4 can be shifted to the lower or higher order. The number of shifted bits can be arbitrarily set. In addition, '0' and '1' of ID 1 to ID 4 denoted by a binary number can be inverted. In addition, the ID code may be shuffled by combining the above rules.

In addition, when each bit of the shuffle pattern is '1', corresponding ID 1 to ID 4 are not shuffled, and corresponding ID 1 to ID 4 can be shuffled when each bit of the shuffle pattern is '0'. If the receiver 40 can shuffle the ID code in the same rule as the transmitter 21, any rule may be determined. That is, the rule (program) of the shuffle pattern stored in the transmitter storage section 25b and the rule (program) of the shuffle pattern stored in the receiver storage section 41b need to be the same.

In the second embodiment, the first data may be data including a preamble, an identification code, an ID code, pressure data, temperature data, a status code, an error detection code, and a stop bit. That is, the transmission data excluding the shuffle pattern can be first data. In this case, the ID code is an ID code that is not shuffled according to the shuffle pattern. The error detection code of the second data is calculated from the ID code, the pressure data, the temperature data, and the status code which are not shuffled.

In the second embodiment, the shuffle pattern may be data for shuffling including data other than the ID code.

In the third embodiment, when the transmitter control unit 25 switches from the first state to the second state, the transmitter control unit 25 can be maintained in the second state regardless of whether or not the detected value exceeds the threshold value. In this case, when the post-production pressure of the transmitter 21 has passed the threshold value or more, and the post-production acceleration of the transmitter 21 has exceeded the threshold value, the post- In this case, the transmitter controller 25 is kept in the third state when the post-manufacturing voltage of the transmitter 21 is below the threshold value. The transmitter 21 may be in the first state at least in a factory that mounts the transmitter 21 to the wheel 11. [ When the above condition is satisfied, the transmitter 21 is already mounted on the wheel 11. [ Therefore, when the state is switched from the first state to the second state, it may not be possible to switch from the second state to the first state.

A receiver that does not collate the ID code in the case where the second data is acquired as the receiver 40 in the fourth embodiment, that is, a receiver capable of only communication using the first data can be used. When the receiver circuit 42 receives the second data, the controller 41 for the receiver determines that the second data is not transmitted to the receiver, and determines that the ID code is not the normal data but the non-regular data. On the other hand, the receiver control unit 41 collates the ID code when the first data is acquired. The transmitter 21 of the fourth embodiment periodically transmits both the first data and the second data. For this reason, the receiver 40 can use a receiver that communicates using the first data.

In the fourth embodiment, the transmitter control unit 25 can transmit the first data at a higher frequency than the second data.

In the first to fourth embodiments, a display device capable of displaying the state of the tire 13 can be connected to the receiver 40. [

In the first to fourth embodiments, at least one detecting unit may be provided.

In the first to fourth embodiments, when the pressure change per unit time or the temperature change per unit time is equal to or greater than the threshold value, the controller 25 for the transmitter can be set to the first state. As the threshold value, a threshold value capable of detecting sudden pressure change or temperature sudden change of the tire 13 is set.

In the first to fourth embodiments, when the error detection code included in the second data matches a plurality of error detection codes calculated by the control unit 41 for the receiver, the second data can be handled as regular data.

In the first to fourth embodiments, when the trigger data requesting transmission of the first data is transmitted from the trigger device 50, the first data can be transmitted from the transmitter.

In the first to fourth embodiments, when the trigger data requesting the transmission of the second data is transmitted from the trigger device 50, the second data can be transmitted from the transmitter. In this case, the transmitter 21 transmits the first data until the trigger data requesting transmission of the second data is transmitted. Further, when the trigger data requesting the transmission of the first data is transmitted from the trigger device 50, the first data can be transmitted from the transmitter 21. In this case, the transmitter 21 transmits the second data until the trigger data requesting transmission of the first data is transmitted.

In the first to fourth embodiments, a signal of a certain frequency band such as a 2.4 GHz band signal may be used as the trigger signal, the radio signal, and the like.

In the first to fourth embodiments, the receiver storage section 41b can store more ID codes than the number of the wheels 11 installed in the vehicle 10. [ For example, the receiver storage 41b can store the ID code of the transmitter 21 mounted on the wheel 11 and the ID code of the transmitter 21 mounted on the spare tire. The receiver storage 41b can store both the ID code of the transmitter 21 mounted on the summer tires and the ID code of the transmitter 21 mounted on the winter tires. In this case, the receiver control unit 41 can notify the abnormality of the tire 13 to the ID codes up to the upper four wheels with high reception frequency.

In each embodiment, the vehicle may be a vehicle having a plurality of wheels, for example, a two-wheeled vehicle.

In each of the embodiments, other than a code for performing error detection as calculation data can be used. For example, exclusive OR data obtained by performing an exclusive OR operation on at least one of ID 1 to ID 4, which is data obtained by dividing an ID code, and variable data can be used as operation data. That is, the operation data calculated from the fixed data and the variable data may be data calculated from a part of the fixed data and a part of the variable data, or may be data calculated from all of the fixed data and all of the variable data.

Since the IDs 1 to 4 are stored in the receiver storage 41b, the receiver controller 41 stores at least one of the IDs 1 to 4 stored in the receiver storage 41b, The exclusive OR data can be calculated from at least one of the included variable data. In this case, the exclusive OR is calculated from the same data in the receiver 40 and the transmitter 21 corresponding to the receiver 40. [ Specifically, the program is stored such that the exclusive OR data is calculated using the same data in the transmitter storage section 25b and the receiver storage section 41b. In this case, the error detecting code is calculated from the data including the exclusive OR.

When the exclusive OR data is used as the operation data, the error detection code may or may not be included in the second data.

When both the exclusive-OR data and the error-detecting code are included in the second data, both of the exclusive-OR data and the error-detecting code can be used as calculation data (verification data). Specifically, the transmitter controller 25 generates second data including exclusive OR data and error detection code, and does not include an ID code. The receiver control unit 41 calculates the exclusive-OR data and the error-detecting code from the variable data included in the second data and the ID code stored in the receiver storage unit 41b when the second data is acquired. The receiver control unit 41, when both the exclusive OR data included in the second daisy and the exclusive ORed data calculated and the error detection code contained in the second data match with the calculated error detection code, Data. According to this, since the ID code can be verified from both matches, the probability of misidentifying the irregular data as regular data is lower than in the case where the error detecting code and the exclusive OR data are used as verification data. When both the exclusive logical sum and the error detection code are used as calculation data (verification data), the sum of the data length of the exclusive-OR data and the data length of the error detection code may be shorter than the data length of the fixed data.

Data calculated from at least one of ID 1 to ID 4, which is data obtained by dividing the ID code instead of the exclusive OR data, and variable data can be used as the operation data. If an operation is performed in the same manner in the controller 25 for the transmitter and the controller 41 for the receiver, the ID code can be verified against any calculation method. Therefore, if the same operation is performed in the transmitter 21 and the receiver 40 that are associated with each other, the calculation method is arbitrary.

In each embodiment, the transmitters 21 and 61 can transmit only the second data. The transmitter control unit 25 and the key control unit 64 always generate the second data when transmitting the transmission data. In this case, the registration of the ID code to the transmitters 21 and 61 (the ID code registration to the transmitter storage 25b and the key storage 67) is performed by reading the QR code (registered trademark) and the bar code, 61), voice recognition, and the like.

In each of the embodiments, the receivers 40 and 70 can collate the ID code only when the second data is acquired without collating the ID code when the first data is acquired. The receiver control unit 41 and the keyless control unit 73 determine whether the transmission data is the second data from the data length or the identification code. The receiver control unit 41 and the keyless control unit 73 do not perform processing such as registration of the ID code or ID code even when the transmission data other than the second data (first data) is acquired, It is judged to be irregular data. The receiver control unit 41 and the keyless control unit 73 collate the ID code by the same control as in the embodiment when the second data is acquired. In this case, the registration of the ID code to the receivers 40 and 70 (the registration of the ID code into the receiver storage) is performed by reading the QR code and the bar code, recording by the wired devices to the receivers 40 and 70, .

In the first to fourth embodiments, when the first data is acquired, the receiver control unit 41 collates the ID code included in the first data with the ID code stored in the receiver storage unit 41b, When the ID code not stored in the storage unit 41b is acquired, the ID code can be stored in the receiver storage unit 41b. In this case, the receiver control section 41 can store the ID code in the receiver storage section 41b by one acquisition, and when the same ID code is acquired consecutively a plurality of times, the ID code is stored in the receiver storage section 41b . There is a possibility that the ID code included in the first data that is accidentally received may be stored in the receiver storage section 41b if the ID code is registered by one acquisition. The ID code is stored in the receiver storage section 41b to prevent the wrong ID code from being stored in the receiver storage section 41b. According to this, the ID code can be stored in the receiver storage section 41b when the fixed data is acquired. Therefore, fixed data can be automatically registered in the receiver storage 41b. The receiver control unit 41 functions as a register unit for storing the ID code included in the second data in the receiver storage unit 41b. The registration unit (registration means) is realized as a function of the control unit 41 for the receiver.

In the first to fourth embodiments, the receiver 40 can store the ID code included in the first data in the receiver storage 41b when the first data is acquired. That is, when the first data is acquired, the receiver control unit 41 does not match the ID code included in the first data with the ID code stored in the receiver storage unit 41b, You can register your code. In this case, the receiver control section 41 can store the ID code in the receiver storage section 41b by one acquisition, and when the same ID code is acquired consecutively a plurality of times, the ID code is stored in the receiver storage section 41b . According to this, the ID code can be stored in the receiver storage section 41b when the fixed data is acquired. Therefore, the fixed data can be automatically registered in the receiver storage 41b. In this case also, the receiver control section 41 functions as a registration section.

In each embodiment, from the three states of transmitting only the first data (first state), transmitting only the second data (second state), and switching states of the first state and the second state, It is possible to arbitrarily set the state of the control unit 25 (keyless control unit 73). The state of the transmitter control unit 25 (keyless control unit 73) can be manually set by the switches provided in the transmitters 21 and 61. [ The state of the transmitter control unit 25 (keyless control unit 73) can be set by a device (for example, a trigger device 50) wired or wirelessly connected to the transmitters 21 and 61 . In this case, the transmission mode of the transmitters 21 and 61 can be changed in accordance with the receivers 40 and 70 mounted on the vehicle 10. For example, when the receivers 40 and 70 that communicate (collate) with the first data are used, the transmitter controller 25 (keyless controller 73) is set to the first state for transmitting only the first data do. When the receivers 40 and 70 that communicate (collate) with the second data are used, the transmitter controller 25 (keyless controller 73) is set to the second state for transmitting only the second data. When the receivers 40 and 70 (receivers of the respective embodiments) that communicate (collate) both the first data and the second data are used, the transmitter control section 25 (keyless control section 73) And the second state are switched. When the state of the transmitter controller 25 (keyless controller 73) is set to a state in which the first state and the second state are switched, the first state and the second state are switched to the mode described in each embodiment.

In each of the embodiments, the receivers 40 and 70 are in a state in which the ID code is verified only when the first data is acquired, a state in which the ID code is verified only when the second data is acquired, and a state in which either the first data or the second data It is possible to arbitrarily set the state of collating the ID code. That is, it is possible to arbitrarily set which one of the first data and the second data, or both of them, should be regarded as regular data. The status of the receivers 40, 70 may be manually set by the switches installed in the receivers 40, The status of the receivers 40, 70 may also be configurable in a device wired or wirelessly connected to the receivers 40, In this case, the receiving side of the receivers 40 and 70 can be changed in accordance with the transmitters 21 and 61 corresponding to the receivers 40 and 70. For example, when the transmitter 21, 61 that transmits the first data is used, the receivers 40, 70 are set to check the ID code when acquiring the first data. When the transmitter (21, 61) for transmitting the third data is used, the receivers (40, 70) are set to check the ID code when acquiring the second data. When the transmitters 21 and 61 that transmit the first data and the second data are used, the receivers 40 and 70 are set in a state of collating the ID codes even when receiving either the first data or the second data .

In each embodiment, the transmitters 21 and 61 can transmit only the first data. The receivers 40 and 70 of the respective embodiments collate the ID code regardless of whether the first data or the second data is received. Therefore, even when the transmitters 21 and 61 capable of transmitting only the first data are used as the transmitters 21 and 61, they can transmit and receive to and from the receivers 40 and 70, respectively.

In each embodiment, the number of bits (data length) of the error detecting code can be appropriately changed if it is smaller than the number of bits (data length) of the ID code. For example, the error detection code may be 16 bits.

The transmitter and the receiver may be used in addition to the tire condition monitoring system 20 or the vehicle communication system 60. For example, when wireless connection is made between a sensor unit provided on an opening and closing member such as a door, a trunk, a bonnet, and a power window, and a vehicle control device (vehicle ECU) mounted on the vehicle, an ID code is set for each sensor unit. The sensor uniquely includes a sensor for detecting the state of the opening and closing member and a transmission circuit for transmitting transmission data including a detection result. The vehicle control apparatus recognizes from the ID code which transmission data is transmitted from which sensor unit. Also in this case, transmission and reception can be performed using the first data and the second data. Further, the first data and the second data may be transmitted from the vehicle control apparatus as transmission data for instructing a control section (e.g., a drive command) to control an actuator mounted on the vehicle.

In addition, the first data and the second data can be used for transmission and reception of a wireless device such as a wireless mouse or a wireless keyboard, and a terminal such as a portable terminal or a personal computer. It is also possible to use the first data and the second data for transmission and reception of a home appliance such as a household power consumption sensor, a fire alarm, a torsion sensor of a building, an air conditioner, and a security sensor for a house. It is also possible to use the first data and the second data for transmission and reception of wearable devices such as a pedometer, a heart rate monitor, a blood pressure monitor, and a glasses type display device, and terminals such as a portable terminal and a personal computer. It is also possible to use first data and second data for transmission and reception of sporting goods such as an accelerator sensor built-in bat or golf club, and terminals such as portable terminals and personal computers.

In each embodiment, the preamble or stop bit can be set to a different value from the first data and the second data. In this case, the receiver control section 41 can discriminate whether the transmission data is the first data or the second data from the preamble or the stop bit.

In each embodiment, the data generation unit and the control unit for switching the data generation unit to the first state or the second state may be separate members. That is, each of the transmitters 21 and 61 may be provided with a device (microcomputer) functioning as a data generation unit and a device functioning as a control unit (microcomputer).

The data included in the transmission data in each embodiment can be appropriately changed. For example, the acceleration data detected by the acceleration sensor 24 in the first to fourth embodiments may be included.

Claims (12)

A transmitter for transmitting transmission data to a receiver,
Power source,
A transmitter storage unit in which identification information is stored;
Data generating means for generating the transmission data including the verification data for collating the identification information stored in the transmitter storage unit and the identification information registered in the receiver with the verification unit provided in the receiver and variable data capable of taking a different value And,
Wherein the data generating unit generates fixed data indicating identification information stored in the transmitter storage unit as the verification data and calculation data capable of generating calculation data calculated from the variable data and having a shorter data length than the fixed data,
transmitter.
The method according to claim 1,
Wherein the calculation data includes an error detection code or an error correction code,
transmitter.
3. The method according to claim 1 or 2,
And a detecting unit for detecting a state of the tire,
Wherein the data generating unit generates the variable data indicating the state of the tire detected by the detecting unit,
transmitter.
4. The method according to any one of claims 1 to 3,
And a control section capable of switching the data generation section to a first state in which the verification data is the fixed data or in a second state in which the verification data is the calculation data,
transmitter.
5. The method of claim 4,
Wherein the control unit counts the number of times of processing from a predetermined counting time point and switches the first state to the second state when the number of times of the processing reaches a processing threshold value or more,
transmitter.
5. The method of claim 4,
And a detecting unit for detecting a state of the tire,
Wherein the control unit switches the first state and the second state based on whether or not the detection value detected by the detection unit is equal to or greater than a threshold value,
transmitter.
5. The method of claim 4,
And a detecting unit for detecting a state of the tire,
Wherein the control unit switches the first state and the second state based on whether or not the detection value detected by the detection unit is equal to or greater than a threshold value and then maintains the second state regardless of the detection value,
transmitter.
A receiver for receiving transmission data transmitted from a transmitter,
A receiving unit for receiving the transmission data;
An obtaining unit that obtains, from the transmission data received by the receiving unit, the verification data included in the transmission data and the variable data capable of taking another value;
A receiver storage unit in which identification information is stored,
A verification unit for verifying the identification information registered in the transmitter that has transmitted the transmission data and the identification information registered in the receiver storage unit based on the verification data and the data indicating the identification information stored in the receiver storage unit Respectively,
When the acquiring unit acquires, as the verification data, fixed data indicating identification information registered in the transmitter and calculation data calculated from the variable data and having a shorter data length than the fixed data, Wherein the identification information registered in the transmitter is compared with the identification information registered in the receiver by checking whether or not the data calculated from the variable data and the data representing the identification information stored in the storage for the receiver coincide with each other,
receiving set.
9. The method of claim 8,
And when the fixed data is acquired by the acquisition unit as the verification data, the verification unit checks whether or not the fixed data and the data indicating the identification information stored in the receiver storage unit coincide with each other, And compares the identified identification information with identification information registered in the receiver,
receiving set.
9. The method of claim 8,
And a registration unit for storing the fixed data in the receiver storage unit,
Wherein the registration unit stores, as the verification data, the fixed data in the receiver storage unit when the fixed data is acquired in the acquisition unit,
receiving set.
11. The method according to any one of claims 8 to 10,
The transmitter is mounted on each of a plurality of wheels provided on a vehicle, detects the state of the tire, transmits the transmission data including the variable data indicating the state of the tire detected,
Wherein the identification information registered in each of the transmitters mounted on each wheel is stored in the receiver storage section,
Wherein the verifying unit verifies the identification information registered in the transmitter and the identification information stored in the receiver storage unit based on the verification data and the identification information stored in the receiver storage unit,
receiving set.
A transmission and reception system comprising a transmitter for transmitting transmission data and a receiver for receiving the transmission data transmitted from the transmitter,
The transmitter includes:
Power source,
A transmitter storage unit in which identification information is stored;
And a generation unit that generates the transmission data including the verification data used for collating the identification information stored in the transmitter storage unit with the identification information registered in the receiver and the variable data capable of taking another value,
Wherein the data generating unit is capable of generating, as the verification data, fixed data indicating identification information stored in the transmitter storage unit and operation data calculated from the variable data and having a shorter data length than the fixed data,
The receiver includes:
A receiving unit for receiving the transmission data;
An acquisition unit that acquires the verification data and the variable data from the transmission data received by the reception unit;
A receiver storage unit in which identification information is stored,
A verification unit for verifying the identification information registered in the transmitter that has transmitted the transmission data and the identification information stored in the receiver storage unit based on the verification data and the data indicating the identification information stored in the receiver storage unit Respectively,
When the calculation data is acquired as the verification data by the acquisition unit, the verification unit determines whether or not the data calculated from the calculation data, the variable data, and the data representing the identification information stored in the receiver storage unit The identification information registered in the transmitter is compared with the identification information registered in the receiver,
Transmission / reception system.

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